Best Air Purifiers 2022 - 72 Purifiers Objectively Reviewed

[@ModernCastle]

Questions? Ask away! I do my best to answer all questions within 24 hours. If you'd ready to buy we've got links below: 1,000+ Square Feet Coverage Buy Oransi Mod - geni.us/fZlzs (Amazon) Buy Medify MA-112 - geni.us/3unIMq (Amazon) Buy Rabbit Air A3 - geni.us/uhXbxS (Amazon) 500-1,000 Square Feet Coverage Buy BlueAir Pure 211+ - geni.us/BCqi5D (Amazon) Buy Levoit LV-H134 - geni.us/BlJPF (Amazon) Buy Dyson Pure Cool DP04 - geni.us/sXnAr1B (Amazon) Buy Pure Cool TP04 - geni.us/WtjL (Amazon) 250-500 Square Feet Coverage Buy Winix 5500-2 - geni.us/BLBYm (Amazon) Buy Coway 1512HH - geni.us/Vu5s (Amazon) 0-250 Square Feet Coverage Buy Levoit Core 300S - geni.us/dB7K (Amazon)

[@wombat7961]

Can you do a video on Brivv air purifier? It uses natural compostable filters like moss, coconut shells and charcoal... They claim to be a really good product and I'd like to know what an objective professional can tell me now that it's been a successful Kickstarter

[@ModernCastle]

@@wombat7961 Once they get off Kickstarter I'll take a look. Generally, I avoid Kickstarter products. Just too often they don't launch or take forever to launch or don't live up to the claims.

[@MariaOrtiz-il9fq]

Is there a way that you can make a video on air purifier radiation? I saw some reviews on Amazon an Levoit. Thank you

[@ModernCastle]

@@MariaOrtiz-il9fq The risk of EMF radiation is very low (based on my understanding). Those reviewers on Amazon may be confusing radiation with ionization / ozone, which I've got a detailed write up here - moderncastle.com/air-ionizer-dangers/ This write-up from Quora dives deeper into discussing the risks (which aren't significant) to more traditional EMF radiation - www.quora.com/How-dangerous-is-the-radiation-emitted-from-air-purifiers

[@knowledgeisfire]

Have you (if not, can you) measured a DIY corsi-rosenthal box?

[@ThatsShowBizBaby]

This dude is breathing the freshest air in 2022

[@rebelstarcustoms]

I saw the thumbnail then followed into this comment and absolutely lost it 😂

[@wetham8667]

✨😂✨💀✨

[@sunnyboy8860]

Now let’s test if he would outlive the average human by air purification

[@maciejrassmus294]

😂😂😂😂😂😂

[@sonulgulati99]

🤣🤣

[@mini_latina2178]

For someone whose doing research about the right purifiers, this video did an amazing job at helping me understand what I wanted for my home. Appreciate how much and time went into providing results for each filter. ❤

[@ModernCastle]

You're too kind :) Thanks so much and I'm glad our video was able to help!

[@izdatbOi]

Same lol this video was perfect for me at the moment.

[@ModernCastle]

@@izdatbOi Yay! Glad the video could help 😄

[@izdatbOi]

@@ModernCastle Me too lol purifier comes in tomorrow 😂

[@ModernCastle]

@@izdatbOi Nice!

[@idleoutcaster]

My man truly cares about his air! Even has a hypoallergenic dog!! Great review as always!

[@ModernCastle]

Lol, indeed. Thanks so much!

[@johnnyboy55]

Bought a Levoit H132 a few weeks ago. Air quality is vastly improved. I used to dust my coffee table 2 or more times a day. Haven’t dusted it once in 18 days. And the light laundry and cigarette smell is totally gone.

[@ModernCastle]

Thanks for sharing your experience. Glad to hear it's working well!

[@SpaceXForce]

Fantastic review. Three things to factor in are 1. the amount of carbon granules provided in each filter 2. the total surface area of the HEPAfilter determined by measuring the length and width ofeach plead x number of pleades and last but not least the country of origin for the filters. Some countries are known for particularly higher quality products than others. Overall, I thihk the Winix is hard to beat in that offers a satisfactory amount of carbon granules, hepa filtration area, air quality monitor, and the filters and machine are made in Korea. For under $175 it's my pick. For higher end, Austin air is powerful.

[@ModernCastle]

Well said on every point. Thanks for your additions to the conversation, Brian!

[@franktalksprogramming]

I feel that thag Winix is a pretty solid choice it filters a lot better than a lot of other filters in the list and has a range of 360 sqft that’s a whole room right there. Getting it for myself thanks for the vod

[@ModernCastle]

My pleasure! Glad it was helpful.

[@sunnyx213]

Thanks to your comment. I did some research and bought one myself! Thank you!

[@ModernCastle]

@@sunnyx213 You're welcome!

[@jaeshasway]

I bought the Oransi Mod. I live in a 900 sf 2 BR, separate living/dining/kitchen apartment and have noticed a significant change in air quality throughout the entire apartment. I wanted something that would clean the entire apartment if the rooms were open. I keep my 2nd bedroom and bathroom doors closed. I probably could’ve made due with the Mod Jr, but I figured I’d get better traction out of the Mod. They’re nearly the same size though and the Jr is 200.00 less. It’s up to 875 sf vs the Mod at up to $1250 sf. I never thought a purifier like this would be in my price range, but I was able to use Affirm to break the payments up over 6 mos which made it affordable and no finance charges or credit interest. Just 6 mos of interest free payments and it’s paid in full. Shipping was free and delivered within 3 days of placing the order online. I bought the package deal with a replacement filter that was on sale on their website. It’s a very simple no frills but all the thrills purifier. No app and no visual dashboard to see air quality stats. But it doesn’t need all that because it simply gets the job done. The filter is a reasonable price and doesn’t require replacement as often as some inferior overpriced models. I’m definitely happy with the purchase. The only con is that I don’t like the fabric on the exterior and had to buy a screen to place over and around it so my cat wouldn’t scratch it or run against it. I used a sheer screen and metal framed small reptile cage to cover it. You literally turn the Oransi Mod on set the level and forget it. Best purchase ever. Highly Recommend it. That said I have two of the H13 Core 300 small room Levoits that I bought several years ago and they’re both work horses and still work great. I bought a large room LV-PUR131 levoit that had very over priced replacement filters, needed 2 replaced frequently, and it no longer turned on after about a year and 1/2 of use. Tried resetting but no power at all. It went 6 mos past the warranty. Unless it’s a small unit for a room where I keep the door closed like the second bedroom and bathroom I will never buy Levoit again. They have a 1 year warranty vs the 3 year Oransi warranty. The reliability and air cleaning ability between the two brands is a no brainer.

[@ModernCastle]

Thanks so much for sharing your experience!

[@KIP_KnowledgeIsPower]

Wow!! Thank you so much for your comment!! I was 🤏 this close to just now buying the larger Levoit + the smaller 300 for my craft room. I’ve had that brand in other completely unrelated (non electric) household things before & loved it but after reading your comment, I’ll definitely research the price of filters in Australia & closer look at the warranty periods first!! I’ve never owned an Air Purifier before so I’m heavily relying on videos (this video is excellent!!) & comments like yours to help guide me. I have 2 cats too so what you said about the one with the material cover thing is definitely something I’ll have to keep in mind too!! I don’t think my babes would scratch at it (maybe🫤) but good God that material if one brushes up against it, I can just imagine so I’ll keep that in mind too when considering… Thank you so much for your detailed comment!! I got a lot from it. You may of saved me an expensive “mistake” & helped me get my monies worth with whatever I do decide on. Big downside to getting your 1st of anything is it’s easy to make an expensive mistake or choose something less efficient cause I wouldn’t know the difference. Thank you!!!! 🤗💜

[@vikingdogmanship]

@@KIP_KnowledgeIsPower May i ask what you decided to get?I have 5 dogs and 2 cats, would appriciate your input 😅

[@kingtrance307]

You obviously work for the company! 😂

[@Ryan-yw8iz]

@@kingtrance307 I thought the same. The way the affirm payments were broken up. 🤣

[@ryanfedora8928]

I got a RabbitAir A3 with the odor eliminator custom filter and couldn't be happier. I don't use the negative ion generator and typically only set it to low/medium speeds for my apartment. I wanted something that could reduce the smell from my cigarette smoking neighbors, and this thing absolutely fixed the problem.

[@ModernCastle]

Nice! Glad it's working well. Thanks for sharing your experience.

[@YuhasLol]

For a 1 bedroom apartment (~800 Sq ft) do you recommend getting 1 large air purifier for the entire place, or 2-3 smaller ones in different rooms? (one for the bedroom, one for the main living area, etc).

[@ModernCastle]

I'd just get 1 big one for a 1 bedroom apartment. Keep it simple.

[@rob4197]

one for the bedroom and one for living room/kitchen. And you are more likely to get big discounted prices for the smaller ones ( more competitive/models).

[@sirbarrett4044]

This is one of the best break down I have every listen to in any category of videos on KZbin. You did an exceptional job.

[@ModernCastle]

You're too kind. Thanks so much, Barrett! Really appreciate your feedback and I'm glad to hear we're making something that's awesome.

[@robjohn2937]

Thanks for showing the noise level as it runs, I am one of the people who like a loud purifier so I can have white noise when I sleep at night.

[@ModernCastle]

My pleasure. Glad to hear it was helpful.

[@hendersonong2413]

Question: Does the Square feet coverage really matter, can I just keep running the air purifier for a longer time to achieve results to a model that covers more Square feet?

[@ModernCastle]

In general, it matters. There is a limit to how far the air can be distributed, especially if it's a less than open space. Additionally, you also have new particulates entering your space all the time. Every time you enter / leave a room, open a door, open a window, cook, clean, etc. If you lived a perfectly sealed room then a small purifier would eventually clean it all.

[@rob4197]

Cooking can create 10x more air polution compare to outside air.

[@ModernCastle]

@@rob4197 That's true. All the more reason to keep an air purifier in your kitchen.

[@stevensalinas9373]

I ended up going with the Rabbit Air A3. I liked the iOS capability and my house is roughly 1600sqft so this will definitely be nice for the largest area of my house. I really like the option to choose what custom filter we wanted too. I went with odor control because we have cats. It came with a 90 day money back so that was cool too just in case. Altogether I spent roughly $830. Thanks for helping brotha!

[@ModernCastle]

Good choice! I hope it works well for you. Thanks so much for the kind words. Glad to hear the video was helpufl.

[@stevensalinas9373]

@@ModernCastle Update, it still works great! Helps during the allergy season. Also, I gave friends who are allergic to cats and they had no issues last time coming over. So it was nice that the air purifier helped with that.

[@ModernCastle]

@@stevensalinas9373 That's great news! Glad to hear it's working out so well. Thanks for sharing.

[@raynatodd3410]

Would have appreciated the price of the units and cost of replacement filters. Also how long the filters generally last.

[@ModernCastle]

Unfortunately, we aren't able to include prices and also participate in the referral link programs that support our work. Weird rule, but one we have to follow. HEPA filters generally last 8-12 months. Some may go as quickly as 3-6, some as long as 13-18 months...but in general, 8-12 is pretty typical across all HEPA filters. Your environment is the biggest determinant in how long it will last.

[@amitpal9815]

Bro the amount of research you put into it and how organised it was I swear down you made finding the right one for me so god fuc*ing easy! THANK YOU 😊

[@ModernCastle]

You're too kind. thanks so much! Glad to hear the video was able to answer all of your questions. If anything else comes up be sure to check out our 2023 version of this video which came out last month - kzbin.info/www/bejne/a4Kag6tmdsameLM&lc=UgyaifdWHt6Y_1xbE_B4AaABAg

[@boneivory2020]

The most detail and comprehensive video made about air purifiers. Appreciate the effort and time went into this video.

[@ModernCastle]

You're too kind. Thanks so much! I am hoping we can make our 2023 version of this video even better. We've got some new tests including ozone, wind speed, better filter cost analysis, and more.

[@nomad1517]

You should do a test in super polluted environments and have a friend with asthma or allergies try them out and see which one gives them the most relief. Try it with pet odors too. See how fast they go away.

[@ModernCastle]

Thanks for your suggestions! I'll keep those in mind for future videos.

[@shantelvailloo8263]

Hi there, which air purifier would you recommend for allergies specifically dust/ dust mites. My home is 600 sqft. I want the best value one thanks in advance

[@ModernCastle]

Removing dust is easy for any reasonably good air purifier. Any air purifier on this list would easily get the job done. For 600 sq. ft. I'd recommend one of these: Buy Hathaspace HSP001 - geni.us/xddy (Amazon) Buy AirDoctor AD3000 - moderncastle.com/go/airdoctor-3000 (AirDoctorPro.com) Buy BlueAir Pure 211+ - geni.us/BCqi5D (Amazon)

[@chelseaconstruction7941]

Great video! Very knowledgeable and thorough with most of the questions I would have in selecting an air purifier.

[@ModernCastle]

Thank you very much! I'm glad to hear it was helpful to you.

[@tomfed9990]

Hello, I would like to ask you and advise me please. I live in the State of Kuwait in the Middle East, and I live in a harsh desert climate and dust. Our stores have many brands such as: 1- Blue Air 2- Samsung. 3- Hitachi. 4- Philips 5- LG I was confused about what to buy, and I packed myself up and bought Blue Air. The question is, is my choice of brand correct?

[@tomfed9990]

HealthProtect™ 7770i I bought a model

[@ModernCastle]

Bluair is a great choice. It performed great in our 2023 round of testing, which you can see here - kzbin.info/www/bejne/a4Kag6tmdsameLM&lc=Ugw7zsBap2q0LuYeTxB4AaABAg

[@tomfed9990]

@@ModernCastle Thank you

[@ModernCastle]

@@tomfed9990 You're welcome

[@Darryl26]

Waiting for my 300S to arrive, glad I made the right choice!

[@ModernCastle]

Nice! I don't think you'll be disappointed. Great machine for the price.

[@curtisthomas2084]

This video has helped me select my perfect Air Purifiers. I have 2 Medify MA-25 purifiers and I am now hoping to get a Winix 5500-2 as a complement. I have a 2 bedroom apartment but I want to get a Medify MA-112 when I buy my home. Thank you for the awesome review.

[@ModernCastle]

That's awesome. Glad to hear the video was helpful!

[@polymathpark]

Can I just say KZbin has made being an informed shopper such a pleasant experience.

[@ModernCastle]

Lol, glad we can help!

[@ginadykeman6166]

What would you best choice for a house with several dogs, Levoit was on my radar, wanting one for there room and a main area . In overall house is 1200 square feet. Maybe two is over kill if one larger one is bought or two smaller better . Thank you

[@ModernCastle]

Any purifier from this list that works for your coverage area would be perfect.

[@sandzork]

Fantastic comprehensive review. Thanks for demystifying Air purifiers

[@ModernCastle]

Our pleasure!

[@DayoAworunse]

For an apartment, should I get one for the main living area and then a dedicated one for the bedroom? I sleep with the door closed so not sure if 1 large one will circulate properly while sleeping.

[@ModernCastle]

Yeah, I think that's a smart way to do it. And exactly what I have in my own home for personal use. I have a large Medify in my living room and then rotate in other mid-sized units for my bedroom. My kids also have a small purifier in each of their rooms.

[@DayoAworunse]

@@ModernCastle thanks so much for the reply!

[@ModernCastle]

@@DayoAworunse My peasure!

[@samim6809]

Thank you for doing the work for me. After just a few searches your video came up and took the info I had gathered and added a bit more and helped me decide on what to purchase. I don't decide these things easily. Saved me a lot of time and brain strain.👍

[@ModernCastle]

Glad I could help!

[@aferlenda05]

Which one did you pick?

[@samim6809]

@@aferlenda05 Levoit Core 300. Should be delivered by tomorrow. I'll try to remember to come back and update how they are ( one for my room and one for my daughter). We have horrible allergies that are crazy in spring.

[@RealNaisuCinema]

@@samim6809 you didn’t remember I need the input lol.

[@samim6809]

@@RealNaisuCinema sorry but have been in hospital for a post surgery hematoma. Back fusion lead to some yucky stuff. Home in bed and doped up. 🤪 BUT!!!... The air purifier is great. Don't forget to take bag off filter inside unit before starting. Lol! Low is like white noise to me. High has some volume but not bad and you wouldn't need that on for long. Seems to move air well. Daughter opened a smelly perfume (as a test) and the air cleared out quickly. I'm very happy with size also. I'm happy with this purchase.

[@9to5techs]

What about the winix 980/winix C909.

[@ModernCastle]

Not models we've tested yet, unfortunately.

[@hollanderson]

Just bought a core 300s from amazon and then realised i should have probably watched a review before purchasing. Luckily it seems to be exactly what I needed. xd

[@ModernCastle]

Core 300 is a good choice! Perfect for most any small space.

[@00_AsH623]

Hi, which one is good for removal formaldehyde?

[@ModernCastle]

None of these are rated to remove formaldehyde. You would need a specialized filter, like this one geni.us/8apBgO (Amazon)

[@Suzq21678]

Hi, this video is sooo helpful! I will subscribe to your channel now. ☺️ Question for you - which out of the 1000+ sq ft models has the most carbon? This is what I’m looking for since our space has a lot of odor.

[@ModernCastle]

Thank you! Oransi mod has the most carbon in it.

[@selamY217]

I just found your channel while doing some research on air purifier. I am learning so much. What would you recommend for an open concept living room and kitchen, we have a dog and a very busy household? We also cook several times a day. I want something that would cover the whole second level of our house. Thanks

[@ModernCastle]

For your open concept area I would go with the Oransi mod - amzn.to/319Bhj8 You could do the same for your 2nd level, but I would guess it's more rooms, less open concept up stairs. Probably better to buy room specific purifiers. I'd do BlueAir Pure 211+ amzn.to/3M0OWia for your big rooms And Winix 5500-2 for your smaller / medium sized rooms - amzn.to/2RjmiBk

[@npaul4171]

This is a great video. I have a Medify MA-112. Of note, the model I have is the variant with the H14 HEPA/UV light. I have a big room, and my issue with a lot of purifiers is that on the higher speeds, they are all pretty loud, and on the lower speeds they don't move a lot of air. The MA-112 moves more air on its lowest two speeds than most other models do on their highest, and so you can get a lot of filtration without a lot of sound. My big criticism of the unit is the short filter durations. They are rated only for around 5 months, and, as you would guess for a unit that uses two massive high-quality HEPA filters, expensive to replace. As you noted in your review, it is a fundamentally basic unit without advanced features, which may also turn some off given the price. That said, it is very good at doing the core thing you want in a purifier, which is high airflow + very good filters = quick reduction of particulate matter/allergens.

[@ModernCastle]

Thanks for sharing your experiences. Very helpful. I agree with basically everything here. Big noise = big air movement But no one wants a super loud purifier on all the time...bit of a catch 22 when it comes to air purification, especially for larger areas

[@npaul4171]

@@ModernCastle Yeah, I'm not crazy about the filter change intervals, but the performance of this unit is unquestionable. In a 1,000+ square foot room, the (EPA AQI) PM2.5 level started at 105, the filter was turned on, and an hour and a half later PM2.5 levels were 0. Measurements were made with a PurpleAir PA-I. It turned pretty dirty air into exceptionally clean air in no time, and seeing the number fall (and my allergies improve) definitely justifies the purchase price and operating expenses.

[@utrutr6013]

Change filters every 5 months?! I thought the large units allowed for filters to be changed less often.

[@utrutr6013]

I just checked the video again and it says the filters last 6-18 months... you are only getting 5 months consistently? Does the unit automatically say "Time to change filter'?

[@npaul4171]

@@utrutr6013 Medify requires the filter be changed every 4-5 months in order to maintain the warranty (they push a filter replacement program where they autoship it every 4th or 5th month). My thought is that the HEPA portion of the filter could last closer to 12-18+ months, but if you do this, you will no longer have the lifetime warranty. I like the unit, but since getting it, one major complaint I have is that the HEPA filter and the carbon pellet chamber are integrated together to make a single filter unit. However, they obviously do not wear at the same rate. They don't have all that much carbon, and the carbon pellets probably exhaust pretty quickly. However, the HEPA filter itself is large and thick, and at the 4-5 month interval, it is probably functioning even better than when new (as HEPA filters initially IMPROVE in their filtration effectiveness over time.) But, as this is a single-piece filter, you have to replace the entire filter unit, which adds more cost. This complaint also applies to numerous other models, such as the Coway Airmega 300/400, which also use an integrated filter unit (mind you, it is rated for a longer filter change interval). Beyond that, the MA-112 is priced comparably to some high-end units that use a separate HEPA filter and a separate carbon filter (and generally contain more carbon). While I like the unit overall, and it is incredibly good at particulate filtration, this is definitely something prospective buyers should think about. Additionally, if they are really concerned about VOCs, this is (along with most of the commonly-discussed units on the market) probably not the best match.

[@ourgardendiary]

Hi, I live in a small bungalow. Does it make sense to buy a small unit for each bedroom and another for the open plan kitchen/living room area? The replacement of filter will cost a lot combined but I'm guessing they'll be needed for each room? Thanks

[@ModernCastle]

In a perfect world, yeah...it's best to have a unit in each room. However, in a practical one, I think you can get away with just having 1 in your bedroom and 1 in your main living room / kitchen area. That's going to cover the bulk of the area you spend most of your time in. Your adjoining rooms will benefit as well.

[@MegaIkedog]

Levoit is overall a fantastic pick! I am really happy that Molekule did not make the list because they are simply overpriced, underperforming garbage. I'm also surprised that no models from Alen made the list. Have you tested any of the Alen models?

[@ModernCastle]

Agreed, Levoit's really are amazing, especially for the price point. There were several other models that arguably could have made this list also. Molekule is a bit of a mixed bag for me. I know the internet at large isn't a fan, but performance wise I've always found them to be solid performers based on our standard testing series. But you're right, they are very expensive...both the unit itself and the replacement filters. Ultimately, their high price point is what kept them off the list this year. Regarding Alen, we haven't tested any Alen's yet. But hoping to later this year. I know many people swear by them.

[@NeftaliPalma]

​@@ModernCastle What is the timeline on a Alen review? Considering Breathsmart 75i vs Levoit vs Rabbit Air

[@ModernCastle]

@@NeftaliPalma No timeline, unfortunately. Currently, we are occupied with other product tests.

[@standforhumanitariancauses4756]

@@ModernCastle We have two 5 in 1 Homedics air purifiers. One smells like chemicals when it's on. It wasn't like that before. But it's emitting a plastic chemical type of odor. whereas the other one which we bought at the same time, doesn't have that issue. What do you think could be the problem??

[@ModernCastle]

@@standforhumanitariancauses4756 1) could be simply that the filters are old 2) could be that you forgot to remove the plastic wrapper from the filter when you first got it 3) could be a defective unit Swap the filters between the two and see if that makes a difference

[@soifulbharye2319]

Hey! Which 500-1000 Sq Ft purifier best to suck all the dust and pet hair/fur? Levoit, Blue air or Dyson?

[@ModernCastle]

They are all about the same, but Levoit and BlueAir are much better value buys compared to Dyson. Unless you just really like the Dyson aesthetic, the others are a better buy.

[@kitlz]

Hello Team, thank you for the very helpful video. Did you also review the Coway Airmega 400? It has been diffifult to find any independent reviews and comparisons of it versus any of the top-recommended 1000+ sq ft models. Kind regards

[@ModernCastle]

Unfortunately, we haven't reviewed that model yet. But it's on our list.

[@LifeLover2020]

I have a 1100 sq foot 3 bed house. Wondering if you might suggest I get one for the living/kitchen (400-500sqft purifier) and possibly some smaller ones for the rooms?

[@ModernCastle]

Get Levoit LV-H134 - geni.us/BlJPF (Amazon) for the living / kitchen And get Levoit Core 300S - geni.us/dB7K (Amazon) for the bed room

[@LifeLover2020]

@@ModernCastle Thank you! I have a levoit 400s currently for living and shark hp102 for bedroom.

[@ModernCastle]

@@LifeLover2020 I wouldn't replace those. Both of those should be fine. We haven't tested Shark yet, but I've got them in my studio now. So they are coming soon and we'll be assessing as part of our 2023 best of video.

[@LifeLover2020]

@@ModernCastle Curious to see what your tests come back with. Appreciate your quick replies and recommendations!!

[@ModernCastle]

@@LifeLover2020 Indeed, I'm interested to see as well. We'll have initial contextual reviews up on ModernCastle.com within the next few weeks. Aiming to have our 2023 best of video out by end of January at the latest.

[@Chillmax]

Perhaps would've been good to include an aesthetics mark, that's important to me. I'm wondering how these were tested in practise, surely if they were all tested in the same room one after another, the results would become less & less accurate, as the air became cleaner & cleaner from the previous tests, so by the end the last model had almost nothing to clean?!

[@ModernCastle]

Tested in the same room over a period of many months / years. If the current air quality in the room isn't sufficiently bad enough we'll add particulates to the space (usually smoke) so it has something to purify. Then we turn the purifier on high, leave it on for an hour, and take measurements before / after. In my view, the most important factor is the level of PM2.5 / PM10 that the purifier is able to get the air quality down to. In 1 hour, most of these purifiers on high mode are able to fully cycle that air numerous times. As a result, if there are still particulates floating after 1 hour it is absolutely the fault of the purifier.

[@babochee]

Same I hate large branding marks.

[@19moods]

Thanks amigo. Levoit 300s for our master bedroom it is. Appreciate you.

[@ModernCastle]

My pleasure! Glad it was helpful.

[@-BarathKumarS]

Woah,i'm amazed that you are responding to all the comments! Keep up the great work man,amazing channel and great video!

[@ModernCastle]

Thanks so much! Much appreciated.

[@billyboyd1199]

Question: If the price tag were not an issue whatsoever, could you do a review of the best air purifier? I really hope you can. that'll be very helpful to see your findings!

[@ModernCastle]

We'll always review whatever we're able to test. So if we come across some super high end purifiers and they are indeed better, they will definitely be in our next video (at least a discussion of them).

[@rob4197]

If money is not a concern, change the filters more often. You will get the most circulated/filtered air because all filters will get clogged up.

[@michellecourtney2736]

We have a 1750 sq ft home with 4 bedrooms & 2 baths. Open floor plan for the living room, kitchen & dining area. What would you recommend? We have a small dog. We have allergies here in Texas. Would 1 system be okay out in the open area or would we also need another in our master bedroom? We have been seeing a lot of advertising for the Sans, have you tested this? Thanks!

[@ModernCastle]

I'd go Medify MA-112 - moderncastle.com/go/medify-ma-112-air-purifier It's got enough air flow that you could place it in a central area of your home and get good home wide purification. I have not tested the Sans purifier (nor have I even heard of it).

[@TeslaRules1856]

We have the recommended Winix 5500-2 in a bedroom. Nice unit and we like the "Real" charcoal filter in it. However we have Austin Air Healthmates in our large family spaces. You should include Austin Air in your tests for large areas - All American made HEPA units.

[@ModernCastle]

Thanks for the suggestion. Hoping to get an Austin air purifier later this year for testing.

[@upy0ur5]

I read alot of recent complaints on Austin Air shipping with dents, dirty units, and malfunctions. Only reason I am hesitant on getting one. Im not sure if this is an Amazon order issue exclusively but there were quite a few complaints directly from the vendor direct purchases.

[@TeslaRules1856]

@@upy0ur5 Both my units are older and have been rock solid. However it seems that these days with shortages of workers and materials - quality is down in alot of different industries. I bought both my units from an Asthma and Allergy supply store on line. I am at the 5 year limit of the internal filter in one of my units so I need to order a replacement. Pricey but you get 5 years !

[@ferhatti78]

Could you tell me why would i buy levoit that can filter till 0,3 micrometer when you could buy a Coway that can filter 0,001 micrometer? Does it mean that the Coway can filter more particles?

[@ModernCastle]

It means it can filter smaller particulates, not necessarily more. Airflow of the unit determines the volume of air (and therefore particulates) that can be removed.

[@sweetpixiesmile]

I'm curious why you rated Dysons so high when other investigative journalists have found them to be overpriced for their effectiveness. Could you review the Jade 2.0 by SurgicallyCleanAir?

[@ModernCastle]

I will agree Dysons are on the more expensive side. But at least in terms of purification performance, they are as good as just about any air purifier. Both PM2.5 and PM10 are in the 0.1 to 0.3 range across their range of models, their oscillation and airflow give them a coverage area of 800 square feet (in the 4th generation models), and they are well respected as a brand for their quality (both in terms of air purifiers and other products). I've not heard of the SurgicallyCleanAir, but I'll take a look at it. Thanks for your suggestion.

[@christyholguin8595]

How often the filters need to be replaced on the Modify MA-112? Have you tested the Modify MA-114 with UV?

[@ModernCastle]

Every 12'ish months should be sufficient for most homes. I haven't tested the 114 yet.

[@madmanmax120]

Just watched your one from 22 years ago and I'm disappointed to see you guys haven't swapped over to actual dollar amounts. I said it in the over video, but why can't you also include actual dollar amounts so that we can know how much we might spend, as vague dollar signs don't actually mean anything in the end.

[@ModernCastle]

Sorry - it's a product of the Amazon Associates program. Amazon doesn't allow creators to discuss price (since they change so often).

[@chln5052]

@@ModernCastle great and very thorough review. As for the viewers that are dissapointed, some people will never be satisfied.

[@ModernCastle]

@@chln5052 Thank you! And very true...no way to please everyone

[@tangofoxtrot40]

Live in the UK and Dyson has been out of stock for a while. Was thinking of Mila but do you k ownif its any good?

[@ModernCastle]

Mila is excellent. It just narrowly missed making this video. But still a fantastic purifier (filter replacements are a bit expensive). See our full review here - moderncastle.com/mila-air-purifier-review/

[@savedbytheblood316]

Does blue air 211 have an ionizer? And are they a true HEPA? TY

[@ModernCastle]

211 uses some type of static and/or ionic technology. Blueair is very vague about it. It is not a HEPA filter.

[@savedbytheblood316]

@@ModernCastle yes they are. I couldn’t get a direct answer from The customer rep and I asked more than once! TY so much!

[@ModernCastle]

@@savedbytheblood316 You're welcome!

[@zerglin]

What do you think about the Xiaomi Mi 3H? I'm looking for a budget option in the Levoit Core 300S price range, because the Coverage Area of the Levoit is a bit low for what I'm looking for. Should I just invest into more costly one or the Xiaomi Mi 3H is good?

[@ModernCastle]

Unfortunately, I haven' tested that model. We did test the Xiaomi 4 Pro, which I found to be excellent. That review is here - moderncastle.com/xiaomi-smart-air-purifier-pro-4-review/ I would expect the Mi 3H is solid.

[@jamomo1371]

What do you recommend for 700 Sq ft, is among the quietest units, has 3 stage filtering (pre, HEPA, carbon), and no smart features (EMF is a concern)? Thanks!!

[@ModernCastle]

Medify MA-112 - geni.us/3unIMq (Amazon)

[@kamalaji1008]

Awesome video. My inherited condo has 1300 sf and I'm about to pull up carpets and remove walls and paint. should I get the Oransi or Medify or another. I think there is controversy about ionization so I must look into that. Thank you so very much.

[@ModernCastle]

I'd go with the Medify, it has larger coverage area. But both are great. And yes, ionizers can be dangerous if they produce ozone. moderncastle.com/air-ionizer-dangers/ - this page explains it

[@savedbytheblood316]

Is the Blue Air 211 ok for people who have asthma, I read somewhere Ozone Iconized air purifiers not good for those of us with lung problems? I appreciate ur thought pls? TY

[@ModernCastle]

Yeah, Blue Air is fantastic. I don't believe Blue Air produces ozone.

[@savedbytheblood316]

@@ModernCastle TY for answering. I live with a cat, just can’t give her up, I’m hoping it helps purify the air. I’ll contact The manufacturer on Monday regarding the ozone. I got two on Sale Amazon Prime day, the following day they raised the price by $100. I love a deal.

[@savedbytheblood316]

@@ModernCastle Can You run these with your central Air?

[@ModernCastle]

@@savedbytheblood316 Yeah, that's no problem at all.

[@ModernCastle]

@@savedbytheblood316 You're welcome. I'm happy I could help.

[@DannyDL1ght]

Hello, what is your opinion on philips 4000 series?

[@ModernCastle]

Not one we've tested yet. I don't have much of an opinion.

[@cruzcntl6999]

where can i find the third party replacement filter for the levoit 300s? is there a link

[@ModernCastle]

There are several options on Amazon - amzn.to/3yEaRqy

[@12eaddison]

which one you recommend for a heavy shedding with 1k plus sf ?

[@ModernCastle]

For heavy shedding, you need a robot vacuum and/or a pet hair cordless / upright. Air purifier will help, but they aren't designed to suck up large quantities of hair. In any case, here are the 3 best for 1K+ sq. ft. 1,000+ Square Feet Coverage Buy Oransi Mod - amzn.to/319Bhj8 Buy Medify MA-112 - amzn.to/3sF6yZy Buy Rabbit Air A3 - amzn.to/31HTo31

[@muko2002]

Can this remover odor smells as well? Im a truck driver as a flatbed driver and for sure when I sweat much I can tell as soon I enter my truck I always clean up but still I know there is a certain smell. Any advice that this can help me ? Also sometime small for a semi truck .

[@ModernCastle]

The purifiers with carbon filters will remove odors. The ones without carbon will not.

[@strawberrylemonade8946]

Which is the best for dust mite allergens and post nasal drip?

[@ModernCastle]

Any of the purifiers in this video are more than capable of handling dust. I would buy the one that has the coverage level appropriately sized to your space.

[@jackharkness1530]

do u recommend the Levoit for a 750 sqft 1br apartment?

[@ModernCastle]

Yeah, Levoit is solid. For that size you'd want to go with one of Levoit's larger units though. amzn.to/3OmLS0q - H134 is the best option.

[@kevinisnguyen]

Are there any purifiers that you recommend with a washable filter? What is your opinion of these types of purifiers with washable filters in general? I've been looking into the Oransi Mod, but saw that the replacement filters are $75.

[@ModernCastle]

AirDog is the only purifier I've tested that has washable filters + reasonably good performance - www.amazon.com/Air-Purifier-Home-Office-Microscopic/dp/B08T21MBFT/ref=as_li_ss_tl?ie=UTF8&linkCode=sl1&tag=mc_1001-20&linkId=e461a95b102cd5f3123a671051329069&language=en_US However, it's notably more expensive for the coverage level and the performance relative to other similar type purifiers is notable worse. Washable filters just don't perform as well as disposable filters.

[@_DEGENERATE]

do you think there’s chemicals and or particulates in the air that aren’t shown/able to be recorded or traced on a normal regulated mass spectrometer? And do you think that the carbon/hepa filters have particulates themselves on them that pollute our air more so but it’s not traced on a mass spectrometer..?

[@ModernCastle]

Yes, though not to a significant extent. And no, I don't think carbon / HEPA filters are polluting the air.

[@TheNompourri]

Thanks for these detailed reviews ! What are your thoughts regarding the Formaldehyde version for Dyson ? Is it something justifying choosing a Dyson Air Purifier over other brands ?

[@ModernCastle]

For the vast majority of consumers, it's just not worth the extra money. Very few homes / offices have a formaldehyde problem. If yours does, this absolutely, it's worth it. But for most, there are better options for less money.

[@TheNompourri]

@@ModernCastle Thanks for your answer, it kind of confirms what I was thinking.

[@ModernCastle]

@@TheNompourri You're welcome

[@jkbgodrad3458]

You rock man, info really came in handy! We are about to purchase and were looking for this type of video exactly.

[@ModernCastle]

You're very welcome! I'm glad I could help.

[@Mirakovska]

Debating between the blue air 211 and levoit h134. Your thoughts?

[@ModernCastle]

Honestly, it's a toss up between them. Both are equally high performance purifiers. I'd buy whatever is cheaper currently.

[@ahmadjaber5482]

@Modern Castle Hi, thanks for the video. It was very helpful. I just need to know which one you recommend to absorb food smell for open spaces for open buffet and event?. Thanks. Reply

[@ModernCastle]

You'll want to go with the IQair GC MultiGas - moderncastle.com/go/iqair-gc-multigas It's got the best odor control we've tested to date.

[@aitatta6219]

I have a 5 bedroom appartement. Do you recommend 5 small ones for each room or does 1 big one for the whole house also the trick?

[@ModernCastle]

You probably don't need 5, but I would suggest perhaps 2 big ones or 3 medium sized ones. In general, your larger units are just better performers all around. I'd much rather have 2-3 big / medium units than 5 single bedroom units.

[@aitatta6219]

@@ModernCastle thank you for the advice I appreciate it 🙏🏽

[@ModernCastle]

@@aitatta6219 My pleasure

[@adrian2303]

Superb review! Just to clarify, does the Medify MA-112 use ionization? I’m really leaning towards this however want to steer away from the whole Ozone. If so, are their any (reliable) larger capacity purifiers that do not have this feature? Thank you in advance.

[@ModernCastle]

It does include an optional ionizer. You can simply turn it off if it's a concern.

[@mr.unknowncali-life9350]

Hi sir . I need a air purifier for my son , he has coughing and allergies the doctors say it’s dust mite . We have a new built house , with carpet . Which air purifier do you recommend for about 400-600sgft space I seen your reviews but do you recommend number 1 over others I can spend up to $400 bucks .

[@ModernCastle]

I would recommend the Levoit H134 - amzn.to/3OmLS0q It's got ample air flow for the space and performed perfect in our tests. And it's well within budget. My only other suggestion is make sure that carpet gets vacuum regularly, as it will continually trap and release fine particulates into the air.

[@mr.unknowncali-life9350]

Thank you , is the rabbit really worth the price ?

[@ModernCastle]

@@mr.unknowncali-life9350 If the smart features are important to you, then yes, it's worth it. If they aren't, then it's not. As there are other purifiers without smart features, but similar purification performance for less money.

[@npaul4171]

If the house is new, you may also want to consider substantial carbon filtration because the house is offgassing VOCs, and this can make asthma and allergies MUCH worse (I was in that same situation growing up). In such a situation, AllerAir, AirPura, Austin Air, and the IQ Air MultiGas excel because they all have 10 or more pounds of carbon, which makes a much bigger difference with VOCs (downside being you will need to change the carbon filtration more often because the VOCs from your new home will exhaust it faster). In addition, you may eventually find yourself having to go to hardwood/laminate/vinyl flooring, as controlling dust mites with carpet is extremely difficult. Further, while I am guessing you have already, a mattress and pillow cover made specifically for dust mites, and laundry detergent additives for bedsheets can help a lot as well. As a kid I was in this exact same situation and it was not fun. I hope your son feels better.

[@mr.unknowncali-life9350]

Yes house was built 2021 December. Thank you so much for this comment . I bought the Alen brand one for my sons room .

[@deaneybwoy4332]

What do you think about shark air purifier max hp202 for mold? Also cool vid

[@ModernCastle]

Mold is a large particulate and therefore easy for most any HEPA purifier to remove. The Shark Max performed extremely well in our tests and will handle mold with ease.

[@JeremyConder]

Does sq foot areas account for 2 story homes? or maybe better question is if i have large one down stairs, will it filter upstairs air?

[@ModernCastle]

It will, though not super well. In a 2 story home you'd really want one for each floor

[@JeremyConder]

@@ModernCastle thanks!

[@ModernCastle]

@@JeremyConder You're welcome!

[@gabrielgiovanni69]

My sister sent me the Hunter digital air purifier in 2021 due to the Oregon fires. It really helped to a degree in my place because I was so close to the fires along the gorge.

[@ModernCastle]

Scary stuff. I imagine you needed to change those filters pretty often.

[@user-ny2oq3ui8t]

Can I have your opinion on the Amway Atmosphere air purifier please 🙏

[@ModernCastle]

Unfortunately, that's not a brand I've tested. I don't have much of an opinion on it.

[@theblitz1687]

Would it hinder performance if air purifier was put in the corner of a room?

[@ModernCastle]

Performance will definitely be better if it was more centrally located, but in general, I've still found perfectly good performance by putting purifiers in the corner. I have 5 air purifiers in my home, each of them in a corner of their respective room. Each of them do perfectly fine. No one usually wants a purifier in a super visible, high traffic area.

[@Kyrox__]

What do you recommend for my dusty room, because I am getting eye problems (I know it’s the house that’s dusty, because when I sleep in a hotel room, my eyes don’t get strained)? Also, this could be a concern with school starting on august 29th, because I lose my focus with strained eyes and it’s overall really distracting.

[@ModernCastle]

Basically anything from this list is going to be fine for dust. Just get the one that's properly sized (or a little over sized) for the size of your space.

[@tiffanysmith8821]

what's your opinion on the shark air purifiers? or larger cowry airmen 400? trying to find something to purify air and get rid of potential mold in basement to start excersizing down there! thank you so much!!

[@ModernCastle]

I don't have a strong opinion on Shark's purifiers. I haven't tested them yet. At least with vacuums, Shark's high end stuff is always great, while their low / mid-tier stuff feels very mediocre. I would guess the same is true of their air purifiers. Haven't tested the Coway 400, but the other models I've tested from Coway have been excellent.

[@MattCantSpeakIt]

I personally mostly care about helping reduce the accumulation of dust in the apartment. I'm not looking to remove smells, or remove microbes from the air or whatever. I would like something I can clean, maybe just tap the dust filter outside, and call it a day. What I do not want is to have to replace a darn HEPA filter every couple months. What is the best product for me?

[@Boodieman72]

I use a Molekule Mini+ in my bedroom after having tried some of the suggested models and I find it works a lot better and the filter subscription service means you always get a new filter when you need one.

[@ModernCastle]

Molekule's are solid performers as well, provided you're okay with the higher price point. As long as it's working well that's really all that matters.

[@Boodieman72]

@@ModernCastle The filter subscription service is something I wish other companies would do.

[@ModernCastle]

@@Boodieman72 Indeed, that would be nice

[@MariusVerbavicius]

@@Boodieman72 you probably just throwing out good filters. Molekule is scam in the first place and get high quality accurate 2.5pm sensor so you can tell when filter needs replacing.

[@Boodieman72]

@@MariusVerbavicius Scam? Explain how they are a scam.

[@hey5746]

This is amazing work!

[@ModernCastle]

Thank you!

[@shade4833]

What do you think about Daikin MC55W ?Looks interesting

[@ModernCastle]

That's not a brand I've heard of before. I don't have any opinion.

[@KatJ3st]

How often do you have to replace filter? Are there standard filter sizes?

[@ModernCastle]

Usually filters usually need to be replaced every 12'ish months. However, your environment, usage, and the specific unit will vary this timing.

[@pandor91]

Hello, this video is really helpful. I'm between the levoit core 300s and the winix zero compact. Winix is using plasma wave which I find interesting.

[@ModernCastle]

Glad the video was helpful! Hard to go wrong with either of those.

[@Freeazabird]

I have FOUR winix and it’s like a jet ✈️

[@iakobkv271]

@@Freeazabird lets go baby

[@AlexisJayne7]

Hello, what are your thoughts of the air doctor 3000

[@ModernCastle]

Overall, fantastic purifier. We recently tested it. See our findings here - moderncastle.com/airdoctor-3000-review/ One or more AirDoctors will almost certainly make our best air purifiers for 2023 list.

[@ellaguo5477]

what is the difference between blueair 211 auto vs blueair protect ？ is protect more worth to buy?

[@ModernCastle]

We haven't tested the Protect yet, so I cannot really say how they compare.

[@CCKnight]

I need an air purifier for a 28 foot camper to help with formaldehyde smells. Please help me find something with less than 300 sq feet that blows out the top. Thanks.

[@ModernCastle]

The Dyson TP09 is the only purifier I'm aware of that removes formaldehyde, but it blows out the side and is way more than 300 sq. ft.

[@Nonalcoholicanonymous]

Living in Chicago right now while we’re #1 worst air quality in the world due to Canadian wildfires. Bought my Levoit Core 300 today in-store before watching this, and I approve 100%! Never realized how captivated I’d be by air purifier data and specs. 😂 Thanks for the reassurance on my purchase. 🙏

[@ModernCastle]

Glad to hear the video was helpful! But sure to check that filter often. If you're dealing with wildfire smoke you may need to replace the filter far more often than you think.

[@Alex2021ZR1]

Is the MA-112 UV model really worth the extra cost? UV only runs for 20min supposedly and has H14 filter that cleans better. But doesn't that mean I'll need to replace more often which means more cost? The non UV is cheaper to run long term?. It will be for large older basement. Can you help me decide? Is this the only one with lifetime warranty too? Thanks.

[@ModernCastle]

UV light is really minor in an air purifier setting, in my view. However, H14 vs. H13 HEPA filter is something. For a $100 difference I'd still go with the H13 version though. The difference in performance is going to be minor.

[@Alex2021ZR1]

@@ModernCastle Thank you sir!

[@ModernCastle]

@@Alex2021ZR1 My pleasure :)

[@staceys1870]

I live in in NYC in the dustiest apartment ever and windows along the street. I have the Coway 400. Is it overkill to keep it in the bedroom? Approx 250 sq ft. Thank you!!

[@ModernCastle]

Nah, def not overkill. With more coverage area you can keep it on a lower power setting so it's not so loud. It'll also mean you can replace the filter less often.

[@staceys1870]

@@ModernCastle Thank you so much!! Ironically, I had a major allergy attack around 4:30 in the morning, and my 400 was on high. This NEVEr happens to me, but we were doing some major cleaning and moving all the furniture around yesterday. The entire day we were cleaning, and sleeping. I had the 400 on high. Do you think this was the left over dust. It really was BAD when we were moving things. Just wondering. Thank you!!

[@ModernCastle]

@@staceys1870 Really impossible for me to say. So many factors involved. That really is a question for your doctor. I don't think I'm qualified to even have an opinion on this.

[@staceys1870]

@@ModernCastle That's completely understandable. I was only "wondering" how effective is the 400 dealing with allergies. My sincere apologies for not being clear! = )

[@ModernCastle]

@@staceys1870 In terms of allergies (and really air quality in general), basically any high air flow HEPA 14 or higher is going to be effective. The higher the HEPA / MERV rating + higher the air flow = the more effective it will be.

[@user-er8zi1ws4n]

Which one do you say is better? The winix 5500-2 air purifier or the blue pure 311?

[@ModernCastle]

We haven't tested The Pure 311, so I cannot say for sure on that. In any case, I expect both brands are similarly high performance. Hard to go wrong with either.

[@shanekeel1072]

As a air purifier for a bedroom of 330 sq ft would you recommend a blueair 311auto to fit the room or go higher to the 211auto to oversize so not to run on high for lower sound while pick up is great?

[@ModernCastle]

I'd go 211, a little extra coverage never hurts and like you say, then you can keep it at a lower volume

[@M.Huling]

Good video, I was just hoping that you would have done a review on”Ganiza” G200S. I was wondering what your thoughts are on this particular air purifier?

[@ModernCastle]

Unfortunately, that's not one I've tested. I don't have any view on it at this point.

[@M.Huling]

@@ModernCastle oh ok, well thanks anyway. Have a great weekend

[@ModernCastle]

@@M.Huling My pleasure

[@pablopicasso9007]

Did you Test the Mi Air Purifier Pro h with CADR 600m^3? Sounds to be a good air Purifier for smokers. Sounds better than the levoit lv-h133 for me, whats your opinion?

[@ModernCastle]

I haven't tested that exact model yet, but we did test the Xiaomi Pro 4 - moderncastle.com/xiaomi-smart-air-purifier-pro-4-review/#purification While the purification performance was excellent, it wasn't quite to the level of the others in this video. Though it's a really thin line of difference between them. Absolutely nothing wrong with a Mi purifier if you prefer them.

[@dlam5342]

What do you think of the blueair 121?

[@ModernCastle]

I haven't tested that model, so I don't have a strong opinion. In our tests of the Blueair 211+ it performed extremely well. I would expect the 121 is a safe pick.

[@KN-ml2gp]

Amazing, many thanks!

[@ModernCastle]

You're welcome!

[@brap17x]

Did you review the Insignia ?

[@ModernCastle]

Not one we've tested yet

[@is92kwlalatina10]

Hi, i have a question I recently just bought SHARP Plasmacluster FP - F40Y and their brand is rly popular here. So sharp claim that their plasmacluster is ozone free and certified global labs for safety, but in the manual it states that the product emits a small level of ozone that's not harmful to breath. Is it true that plasmacluster didn't produce any ozone, or if it is then is it safe to use it? Thank you

[@ModernCastle]

That's not a model we've tested. I don't know how it will perform or whether or not it creates ozone.

[@LuLuBlue1212]

What do you think of the Dyson TP7A with Auto-React?

[@ModernCastle]

Not one I've tested, but looks basically identical to the TP04 and TP07. This whole "auto-react" just feels like they are trying to put a new new label on something that every 4th generation Dyson air purifier was already doing...sensing air quality and adjusting as needed. I like Dyson, but that type of marketing is very disingenuous.

[@Barb5865]

was going to purchase the Coway that was reviewed, but was concerned about it not being ozone free like the Levoit. Is this a concern I should consider?

[@ModernCastle]

Coway says that it releases very low levels of zone, lower than the federal limits. You'll have to decide if that's safe enough for you. At least for personal use, I prefer to not use any type of ionizer.

[@knotslip8862]

Great review. What are your thoughts regarding the release of ozone by some hepa filtration devices?

[@ModernCastle]

HEPA filters do not release any ozone. Ionizers release ozone, which are fairly uncommon among most air purifiers. In cases where we do so ionizers they are so low power they either create no ozone or very little.

[@nomad1517]

Get one with an on off option, and CARB certified. If you have asthma, avoid the ionization option. If you have strong odors you need a purifier with crap tons of carbon. Like in the lbs. Check out these: Allen, Oransi, Aeris, IQair, Austin. Dyson (yes, Dyson, trust me, they work very well) Those are your best bets from research and experience.